body {
  /* 垂直方向flex，居中 */
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
  font-family: Arial, sans-serif;
}

h1 {
  margin-bottom: 20px;
}

.item-list {
  list-style-type: none;
  padding: 0;
}

.item-list li {
  /* 水平flex */
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px;
  border-bottom: 1px solid #ddd;
  width: 200px;
}

.favorite-icon {
  font-size: 1.25rem;
  background-color: transparent;
  border: none;
  cursor: pointer;
}

.filled {
  color: #d22b2b;
}